There hasn't really been a unified thread for this, so I will take the liberty to create a thread dedicated to compiling and organizing friend codes/gamertags for the various next-gen consoles. Simply post your friend code or gamertag in this thread (along with game if it is a DS game), or alternatively PM it to me, and I'll keep a tally in the original post.

If all this stuff is related to online gaming, can someone please share how Final Fantasy III DS is set up for online play? Or is that just for some kind of online stat/comparison system like the DW games have had?

"We spread the time as we can, but in the end the world takes it all back."— Roland Deschain, Wolves of the Calla

FF3 DS isn't online in the traditional sense. It utilizes a mail service (Mognet) that you use to send messages to other players with. There's an extra class and bonus dungeon that are only unlockable if you send or receive 7 wifi mails via mognet.